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Peer-reviewedCC BYScience Advances

Additional evidence supports a timescale exceeding 100,000 years for the Guliya ice cap, Tibetan Plateau

  • Lonnie G. Thompson1,2
  • Mary E. Davis1
  • Ellen Mosley-Thompson1,3
  • Juerg Beer4
  • Tandong Yao5
  • Christof Vockenhuber6
  • Ninglian Wang7
  • Ling Fang7
  • Marcus Christl6
7 affiliations
  1. 1Byrd Polar and Climate Research Center, The Ohio State University, Columbus, OH 43210, USA.
  2. 2School of Earth Sciences, The Ohio State University, Columbus, OH 43210, USA.
  3. 3Department of Geography, The Ohio State University, Columbus, OH 43210, USA.
  4. 4Swiss Federal Institute of Aquatic Science and Technology, Dübendorf CH-8600, Switzerland.
  5. 5Key Laboratory of Tibetan Climate Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China.
  6. 6Laboratory of Ion Beam Physics, ETH Zurich, 8093 Zurich, Switzerland.
  7. 7College of Urban and Environmental Sciences, Northwest University, Chang’an District, Xi’an 710127, China.
Open at sourceDOICite

Abstract

The oxygen isotope (δ 18 O ice ) record from a ∼310-meter core drilled on the Guliya ice cap (GIC) in 2015 (GP2015) demonstrates reproducibility with a ∼309-meter core drilled nearby in 1992. Construction of the timescale for a composite of the GIC cores used 10 Be and 36 Cl to locate the 41–thousand year Laschamp geomagnetic excursion and a match to a δ 18 O atm -dated core from the Guliya Summit. Comparison of the δ 18 O record from an Asian Monsoon speleothem with the GIC δ 18 O ice supports a timescale back to 128 thousand years, the oldest known so far from Tibet. The δ 18 O ice record shows orbital variations in phase with June insolation and polar ice core stable isotope records through the last glacial cycle, although the relationship is reversed since the deglaciation. Future investigation is required to resolve this observation. Radiocarbon-dated ice from the glacier margin supports the presence of glacial-stage ice in the GIC. The 36 Cl/ 10 Be ratios in GP2015 confirm that GIC ice is older than 100 thousand years.

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Cite

BibTeXRIS
BibTeX
@article{thompson2026additional,
  title = {{Additional evidence supports a timescale exceeding 100,000 years for the Guliya ice cap, Tibetan Plateau}},
  author = {Lonnie G. Thompson and Mary E. Davis and Ellen Mosley-Thompson and Juerg Beer and Tandong Yao and Christof Vockenhuber and Ninglian Wang and Ling Fang and Marcus Christl},
  journal = {Science Advances},
  year = {2026},
  month = oct,
  doi = {10.1126/sciadv.aeh2912},
  url = {https://www.science.org/doi/10.1126/sciadv.aeh2912},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Additional evidence supports a timescale exceeding 100,000 years for the Guliya ice cap, Tibetan Plateau
AU  - Lonnie G. Thompson
AU  - Mary E. Davis
AU  - Ellen Mosley-Thompson
AU  - Juerg Beer
AU  - Tandong Yao
AU  - Christof Vockenhuber
AU  - Ninglian Wang
AU  - Ling Fang
AU  - Marcus Christl
PY  - 2026
DA  - 2026/10/02
JO  - Science Advances
DO  - 10.1126/sciadv.aeh2912
UR  - https://www.science.org/doi/10.1126/sciadv.aeh2912
AB  - The oxygen isotope (δ 18 O ice ) record from a ∼310-meter core drilled on the Guliya ice cap (GIC) in 2015 (GP2015) demonstrates reproducibility with a ∼309-meter core drilled nearby in 1992. Construction of the timescale for a composite of the GIC cores used 10 Be and 36 Cl to locate the 41–thousand year Laschamp geomagnetic excursion and a match to a δ 18 O atm -dated core from the Guliya Summit. Comparison of the δ 18 O record from an Asian Monsoon speleothem with the GIC δ 18 O ice supports a timescale back to 128 thousand years, the oldest known so far from Tibet. The δ 18 O ice record shows orbital variations in phase with June insolation and polar ice core stable isotope records through the last glacial cycle, although the relationship is reversed since the deglaciation. Future investigation is required to resolve this observation. Radiocarbon-dated ice from the glacier margin supports the presence of glacial-stage ice in the GIC. The 36 Cl/ 10 Be ratios in GP2015 confirm that GIC ice is older than 100 thousand years.
SN  - 2375-2548
ER  -